package daa.levelup;

  /*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */



/*
 * DocumentEventDemo.java requires no other files.
 */

import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.Document;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;



    public class DocumentEventDemo extends JPanel
            implements ActionListener {
        JTextField textField;
        JTextArea textArea;
        JTextArea displayArea;

        public DocumentEventDemo() {
            super(new GridBagLayout());
            GridBagLayout gridbag = (GridBagLayout)getLayout();
            GridBagConstraints c = new GridBagConstraints();

            JButton button = new JButton("Clear");
            button.addActionListener(this);

            textField = new JTextField(20);
            textField.addActionListener(new MyTextActionListener());
            textField.getDocument().addDocumentListener(new MyDocumentListener());
            textField.getDocument().putProperty("name", "Text Field");

            textArea = new JTextArea();
            textArea.getDocument().addDocumentListener(new MyDocumentListener());
            textArea.getDocument().putProperty("name", "Text Area");

            JScrollPane scrollPane = new JScrollPane(textArea);
            scrollPane.setPreferredSize(new Dimension(200, 75));

            displayArea = new JTextArea();
            displayArea.setEditable(false);
            JScrollPane displayScrollPane = new JScrollPane(displayArea);
            displayScrollPane.setPreferredSize(new Dimension(200, 75));

            c.gridx = 0;
            c.gridy = 0;
            c.weightx = 1.0;
            c.fill = GridBagConstraints.HORIZONTAL;
            gridbag.setConstraints(textField, c);
            add(textField);

            c.gridx = 0;
            c.gridy = 1;
            c.weightx = 0.0;
            c.gridheight = 2;
            c.fill = GridBagConstraints.BOTH;
            gridbag.setConstraints(scrollPane, c);
            add(scrollPane);

            c.gridx = 1;
            c.gridy = 0;
            c.weightx = 1.0;
            c.weighty = 1.0;
            gridbag.setConstraints(displayScrollPane, c);
            add(displayScrollPane);

            c.gridx = 1;
            c.gridy = 2;
            c.weightx = 0.0;
            c.gridheight = 1;
            c.weighty = 0.0;
            c.fill = GridBagConstraints.HORIZONTAL;
            gridbag.setConstraints(button, c);
            add(button);

            setPreferredSize(new Dimension(450, 250));
            setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
        }

        class MyDocumentListener implements DocumentListener {
            final String newline = "\n";

            public void insertUpdate(DocumentEvent e) {
                updateLog(e, "inserted into");
            }
            public void removeUpdate(DocumentEvent e) {
                updateLog(e, "removed from");
            }
            public void changedUpdate(DocumentEvent e) {
                //Plain text components don't fire these events.
            }

            public void updateLog(DocumentEvent e, String action) {
                Document doc = (Document)e.getDocument();
                int changeLength = e.getLength();
                displayArea.append(
                        changeLength + " character"
                                + ((changeLength == 1) ? " " : "s ")
                                + action + " " + doc.getProperty("name") + "."
                                + newline
                                + "  Text length = " + doc.getLength() + newline);
                displayArea.setCaretPosition(displayArea.getDocument().getLength());
            }
        }

        class MyTextActionListener implements ActionListener {
            /** Handle the text field Return. */
            public void actionPerformed(ActionEvent e) {
                int selStart = textArea.getSelectionStart();
                int selEnd = textArea.getSelectionEnd();

                textArea.replaceRange(textField.getText(),
                        selStart, selEnd);
                textField.selectAll();
            }
        }

        /** Handle button click. */
        public void actionPerformed(ActionEvent e) {
            displayArea.setText("");
            textField.requestFocus();
        }

        /**
         * Create the GUI and show it.  For thread safety,
         * this method should be invoked from the
         * event-dispatching thread.
         */
        private static void createAndShowGUI() {
            //Create and set up the window.
            JFrame frame = new JFrame("DocumentEventDemo");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            //Create and set up the content pane.
            JComponent newContentPane = new DocumentEventDemo();
            newContentPane.setOpaque(true); //content panes must be opaque
            frame.setContentPane(newContentPane);

            //Display the window.
            frame.pack();
            frame.setVisible(true);
        }

        public static void main(String[] args) {
            //Schedule a job for the event-dispatching thread:
            //creating and showing this application's GUI.
            javax.swing.SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    createAndShowGUI();
                }
            });
        }
    }

